Pulley



D. H. BENJAMlN.

PULLEY.

APPLICATION FILED NOV%23. i916. RENEWED MAR. 31. I919.

Patented Nov. 11,1919.

7 Application filed veniently manipulated for securing it to the shaft;which'has no parts projecting beyond the limits of the rim eitherradially or longitudinallyof the shaft and is therefore safe and guardedagainst liability but which nevertheless has the operating parts freelyaccesslble for manipulation; and whichfhas tremendous holding power andcan be so firmly clamped to the shaft that it willnot work loose.Further objects of the invention will be in part obvious and in partwill appear more in detail hereinaften- The invention comprises thepulley hereinaf-ter described and claimed.

' In the drawings, which represent oneem bodiment of the invention,Figure 1 is an end view; and Fig.2 is a sectional elevation on the line22, Fig. 1, looking in the directionof the arrow.

The pulley shown in the drawings is split along the line A-' 'into twohalves capable of separation for assembling the pulley on a shaft andremoving prisesa hub consisting of two members 10 and 10, a body formedof two members, 11 and 11 and the rim members 12 and 12*. Between thetwo hub members: is located a wide shallow slot 13 so arranged that thetwo halves of the pulley abut only at the outer ends of the two bodymembers, as at 14, and at the ends of the rimmembers, the centralportions of the two members having sufficientresiliency to enable themto be bent inwardly very slightly toward "each other for producing-theclamping efiect to secure the hub by friction firmly and rigidly uponthe shaft 15, which passesthrough a hole in the center of the twohu'b'members.

The hub members may be integral portions of the body members but asshown are semi-cylindrical in form, provided with the A HeBENJAMIN, 0FCLEVELAND, OHIO.

- PULLEY.

of accident,

it therefrom. It com-' Patented Nov. 1 1,1919-.

November 23,1916,'Seria1 No. 133,032. Renewed March 3, 1919. Serial No.280,488.,

necessarybore for the shaft, and fitting. in

a cylindrical cavity in the two body mem-' bers, which in turn, areeither secured to or integral with the rim members. The body members arealso so formed as to provide cavities or recesses 16, 16 ,'adjacent therim members to receive some of the operating parts of the device, aswill appear. Body membersll and 11 are provided with transverse holes-17, which lie on either side" ofthe shaft 15 and are of uniform width"from end to end transversely of said shaft, but

taper or have walls gradually diverging from bottom to top, as shown inFig. 2. In

I the particular form of the invention shown there are four of theseholes located in pairs, the holes of each site. each other. Each pair ofholes repair being directly oppoceives the arms 18 of a U-shaped'clamping member 19, shown as formed of a bent metal bar, the free endsof whose arms are bent or otherwise formed to provide hook members 20engaging over member 19 lies in one of the recesses 16, 16*,

while the bar or rod 21 lies in the other a transverse bar or rod 21.The middle portion 22 of each clam-ping clam-ping bolts 27 extendingthrough open' ings in the body member 11*. Thesebolts maybe any suitableform but are shown as blind bolts consisting of two headed membershaving telescoping threaded engagement with each other, asat '28, withinthe body member 11. The bolts can therefore be tightened up withoutleaving projecting ends v of the bolt beyond the usual as with thecommon types of bolts. tightening up the forced in'between the clampingmembers 19 and'the body member body members toward each other to clampthe hub members upon the shaft,

Cooperating with each'clamplng clamping nuts,

member 19 is what may be termed a toggle member By bolt the wedge memberis 11 and forces the two pulley is of cess or cavity 3 of g in' arewhich cavity also l s-Ri member and member 10, toggfe'ineiil berextending outwardly into the space 16 where they are provided with eyes32 through which pass the rods 21 before referred to. The walls of therecess 30 diverge upwardly, as shown in Fig. 2. Between the rods 21 andthe adjacent body member 11 is located a slide 33,'seated in a recess 34of the body member and operated by bolts 35 in the same manner as theclamping wedge 23. outwardly extending ears 36, two of which areprovided for each rod 21, said ears having elongated slots-37 throughwhich the rods extend.

r The shaft by placing its two halves upon the shaft and pushing arm 18of the clamping up through their holes until: of the rod 21,

its bolts to the right in Fig. 2, which tight ens up the clamping member19 and exerts an initial clamping effect upon the hub The bolts 35 theslide 33 to the right inFig. 2. It will be observed that the arms 18 ofthe clamping members 19 are inclined from a straight transverse positionin Fig. 2, and arms of the toggle member 34 are likewise inclined but ata more acute angle. Consequently when the slide 33 is adjusted the rods21 are carried to the right and swing outwardly with the eyes 32 aroundthe axis of the middle portions 36 of the toggle members. The arms 34and 18 tend to move into line with each other, and a tremendous pressureby the Wedge members of the pulley.

clamping eifect'is produced by the toggleaction ofthe two U-shapedmembers. Indeed the clamping effect is so great that when the up it ispractically impos pulley from the shaft 6X- bolts are screwed sible toloosen the cept by unscrewing the bolts.

While in the drawings I have shown two; f

sets of clamping members 19 and cooperatmg toggle members 34,-it will beunderstood that one set of said members is sufficient and that more thantwo can be used when the greater extent lengthwise of the shaft. Aplurality of sets of clamping de-' vices are utilized to more evenlydistribute the pressure along the hub members 10 and 10 In the pulleydescribed'the two halves can be very conveniently assembled around ashaft already installed. Moreover, the clamping effect is produced bolts27 i This slide is provided with pulley described is secured to the isthen adjusted by are then screwed up to adjust that the j entirely bythe and 35, which are conveniently ac- CeSSible 1; th end p s of tholfilfl te I and Wiflpulley and can b 3. 7. i ces ar'e t tsY does awaywith the clamping effect. Again, 'a71l-eve (h0g9 erative parts arecontained within the line...

of the rim so that there are no projections which might catch uponclothing or other parts and cause accident.

Further advantages of the invention will be readily apparent to thoseskilled in the art. V

What I claim is 1. A pulley, comprising two members adapted to embrace ashaft, a U-shaped clamping device having arms passing through openingsin the two pulley members for connecting the same, a rod connectingthefree ends of said arms,

device and one of said pulley members for clamping said. pulley to theshaft.

2. A pulley, comprising two members adapted toembrace a shaft, andtoggle means 1 other and means for straightening'said inclined membersto secure thepulleytothe shaft 4. A pulley,

adapted to embrace a shaftf a-U-shaped member connecting the two pulleymembers and embracing theshaft, asecond 'U-shaped member lying'on oneside of the shaft, a rod connecting the arms of said U'-shaped mem bersand meansfor' adjusting said rod to produce a toggle effect and securethe pulley to the shaft.

5. A pulley, comprising 'two" members adapted to embrace a shaft, a"clamping member connecting the members of said pulley, means forproducing a wedge effect at one end of said or producing a toggle effectat the other end of said clamping member for securing the pulley to-theshaft.-'. i

6. A pulley comprising two members adapted to embrace'a'shaft, aclamping member connecting the members of said pulley, a movable wedgecooperating with one end of said clamping memberfand an adjustabletoggle device engaging the other' end of said clamping member forsecuring the pulley to the shaft. i 7. A pulley, comprising two membersadapted to embrace: a shaft, a clamping member; connecting the twomembers of the pulley, a swinging toggle member corineoted" and a wedgemovable between the middle portion of said clamping members, saidrelatively in clined members being connected to each comprising twomembers" clamping member, and means to one end of said clamping member,and

means for turning said toggle member to to one end of said clampingmember, a movable slide, and means eonnectlng said shde t0 SL1dswln'glng toggle member for turning 10 the same to clamp the-pulley tothe shaft.

In testimony whereof, I alfix my signature.

DANA H. BENJAMIN.

Copies of this patent'may be obtained for five cents each, by addressingthe Commissioner of Patents.

Washington, D. G.

